09-10-2014, 04:11 PM
This study investing the dynamic response setback building with long and narrow one storey base and symmetric slender tower, including in-plane flexibility of the floor diaphragm. A continuum model is developed to investigate the behaviour of such buildings. The building is analysed by treating setback level floor as bending beam, ground storey walls or frames as distributed shear beam system and slender tower as shear beam. The resulting equations of motion and the boundary conditions are solved to obtain dynamic properties of the structure. A parametric study has been carried out to investigate the effect of setback parameters on the response of a setback building. The parametric study compares the effect of variation in level of setback and aspect ratio of setback level floor on natural periods, mode shapes, modal shear coefficients, maximum floor displacements and maximum inter- storey drifts of setback building using two models viz, the continuum model developed here treating the floor flexible and vertical stepped shear bean model (Jhaveri, 1967) that treats the f